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J Appl Physiol 85: 2118-2124, 1998;
8750-7587/98 $5.00
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Vol. 85, Issue 6, 2118-2124, December 1998

The VO2 slow component for severe exercise depends on type of exercise and is not correlated with time to fatigue

Veronique L. Billat1, Ruddy Richard2, Valerie M. Binsse2, Jean P. Koralsztein2, and Philippe Haouzi3

1 Laboratoire Science du Sport, Lille 2, Lille; 2 Institut Coeur Effort Santé, 75005 Paris, and Centre de Médecine du Sport Caisse Centrale des Activites Sociales, 75010 Paris; and 3 Laboratoire de Physiologie, Faculté de Médecine de Nancy, 54505 Vandoeuvre-lès-Nancy, France

The purpose of this study was to examine the influence of the type of exercise (running vs. cycling) on the O2 uptake (VO2) slow component. Ten triathletes performed exhaustive exercise on a treadmill and on a cycloergometer at a work rate corresponding to 90% of maximal VO2 (90% work rate maximal VO2). The duration of the tests before exhaustion was superimposable for both type of exercises (10 min 37 s ± 4 min 11 s vs. 10 min 54 s ± 4 min 47 s for running and cycling, respectively). The VO2 slow component (difference between VO2 at the last minute and minute 3 of exercise) was significantly lower during running compared with cycling (20.9 ± 2 vs. 268.8 ± 24 ml/min). Consequently, there was no relationship between the magnitude of the VO2 slow component and the time to fatigue. Finally, because blood lactate levels at the end of the tests were similar for both running (7.2 ± 1.9 mmol/l) and cycling (7.3 ± 2.4 mmol/l), there was a clear dissociation between blood lactate and the VO2 slow component during running. These data demonstrate that 1) the VO2 slow component depends on the type of exercise in a group of triathletes and 2) the time to fatigue is independent of the magnitude of the VO2 slow component and blood lactate concentration. It is speculated that the difference in muscular contraction regimen between running and cycling could account for the difference in the VO2 slow component.

oxygen slow component; fatigue; running; cycling


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